Rob Kardashian‘s posting some pics of himself on social media….so you know he’s losing weight.

On Wednesday, the KUWTK star took to Instagram to flaunt his weight loss (and a weird, squinty scowl?) in a rare full body pic. His caption?

“🚂🚂🚂”

Yep, keep chugging along! Er, is chugging the right word? Oops. No more chugging, unless it’s calorie-free, dude. Sounds like Rob’s trying to set an example for his new daughter, and keeping on track with Blac Chyna nipping at his feet.

Also, sometimes I forget Rob was actually pretty svelte, and looked a lot like a dude version of Kim Kardashian at one point. Check out a throwback pic below! Not sure if he’ll ever be THAT lean again, but who knows!